/*
 * Copyright ${inceptionYear} - ${year} ${owner}
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.exodus;

import org.jetbrains.annotations.NotNull;

import java.util.Map;

/**
 * Listener of configuration changes. Implementations define custom reactions on changes of particular settings.
 * E.g., {@link jetbrains.exodus.env.Environment} implementation suspends/resumes database GC on switching
 * readonly mode on/off.
 */
public interface ConfigSettingChangeListener {

    void beforeSettingChanged(@NotNull String key, @NotNull Object value, @NotNull Map<String, Object> context);

    void afterSettingChanged(@NotNull String key, @NotNull Object value, @NotNull Map<String, Object> context);

    class Adapter implements ConfigSettingChangeListener {

        @Override
        public void beforeSettingChanged(@NotNull String key, @NotNull Object value, @NotNull Map<String, Object> context) {

        }

        @Override
        public void afterSettingChanged(@NotNull String key, @NotNull Object value, @NotNull Map<String, Object> context) {

        }
    }
}
